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Flowlines 200–100,000 at kinematic viscosities of 20cSt, 100cSt, 175cSt, 300cSt and 500cSt.

A second stage of test work addressed gas entrainment, which has the potential to lead to substantial mis-measurement, at a kinematic viscosity of 500cSt with a

GVF range of 0-5%.

The research found that viscosity effects are signifcant and must be taken account, as most meter technologies have a high dependence on Reynolds number, particularly at low Reynolds numbers.

They must be calibrated at the viscos- ity/Reynolds number range they will be operated at. Pressure drop is signifcantly

NEL’s laboratories at East Kilbride, near Glasgow.

higher than for conventional oils, and therefore means meters are more costly to due to complete next year. known to infuence properties, other than operate. NEL says the standard practice for fuid viscosity, that may also be critical to “Alternatively, they are oversized calibrating Coriolis fowmeters for the oil measurement uncertainty.

Although there has been some (to reduce velocity and hence pressure and gas industry has been to match the research into the performance of Coriolis drop). However, this means they are fuid viscosity and, if possible, the fuid fow meters at high temperature and operating at the low end of their turn- temperature and pressure. pressure, only a small amount of inde- down, i.e. the place they are most inac- However, matching all parameters is pendent and traceable data exist on cer- curate—it’s a balancing act,” NEL says. seldom possible, due to the limitations tain meter types and diameters. The JIP

Recently, the Temperature and Pressure set by the calibration facilities test fuids. will look at the performance of Coriolis

Effects on Coriolis Flow Meters JIP was Because of this, the parameter that is fow meters with onboard temperature launched, with participation from Shell, most often matched is the fuid viscosity. and pressure compensation to provide

BP, Nexen Petroleum, ConocoPhillips, A limitation of this approach is that 9067-SubseaExpoAD-OE-Mag-177x123.ai 1 28/10/2013 12:20 traceable data.

Talisman-Sinopec, TAQA, and CNR. It is temperature and pressure variations are

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